R.I. Gen. Laws § 31-15-1: Right half of road.

Upon all roadways of sufficient width a vehicle shall be driven upon the right half of the roadway, except as follows:

(1) When overtaking and passing another vehicle proceeding in the same direction under the rules governing the movement;

(2) When the right half of a roadway is closed to traffic while under construction or repair;

(3) Upon a roadway divided into three (3) marked lanes for traffic under the rules applicable to it; or

(4) Upon a roadway designated and signposted for one-way traffic.

(5) Violations of this section are subject to fines enumerated in § 31-41.1-4.